Screw-bolt



(3T0 Mode l.) 1

E. DE P. SHBLTON.

SCREW BOLT.

No. 375,206.. Patented Dec. 20. 1887.

N. PUERS, PMlo-Lkhopaphcr. Wahinilbn. D C,

UNITED STATES PATENT OFFICE.

E. DE FOREST SHELTON, or BIRMINGHAM, CONNECTICUT.

SCREW-BOLT.

SPECIFICATION forming part of Letters Patent No. 375,206, dated December20, 1887.

(No model.)

To all whom it may concern.-

Be it known that I, E. DE FOREST SI-IELTON, a citizen of the UnitedStates, residing at Birmingham, in the county of New Haven and State ofConnecticut, have invented certain new and useful Improvements inScrew-Bolts; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates to certain improvements in screw-bolts, lag-screws,and the like, and has for its object to provide a head for said screwsor bolts which shall be so conformed that it may be turned by wrenchesand tools of various kinds; and with this end in view my inventionconsists in the details of construction hereinafter fully set forth, andthen recited in the claim.

In order that those skilled in the art to which my invention appertainsmay fully understand my invention, I will now describe my device indetail, reference being had to the accompanying drawing, which forms apart of this specification, and which exhibits a screw-bolt made inaccordance with my improvement.

l is the shank of the screw'or bolt, and 2 the threaded portionthereof.

3 is a projecting abutmentshoulder, above which is the head 4., which issquare in crosssection and may be grasped by any ordinary wrench.Extending through the head 4, and preferably in both directions, areholes 5, for the insertion of a pin-wrench.

6 is a slot cut into the top of the head to admit of the use thereon ofan ordinary screwdriver.

From the foregoing it will readily be seen that my improved bolt-head isexceedingly advantageous, since it may be turned by any one of severalimplements.

In many connections where such bolts or screws are used it might befound impracticable to use one of the three tools above named, but wherethe screw might be turned by means of one of the others.

Having thus described my invent-ion, I claim- As an illllJI'OX'Gdarticle of manufacture, a bolt or screw, the same having the shank 1,the screw-threaded portion 2, the projecting abutmentshoulder 3, thesquare head 4, the transverse pin-wrench holes 5, and the slot 6,substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

E. DE FOREST SHELTON.

Witnesses:

ERNEsT S. STArnns, WILLIs K. HEATH.

